▎ 摘　　要

NOVELTY - Modification of graphene separator involves (S110) mixing graphene powder with an aqueous binder and a solvent and stirring to form an aqueous graphene dispersion, (S120) coating the aqueous dispersion of graphene on one surface of the separator component to form a graphene coating film, and (S130) forming a graphene coating layer by drying the graphene coating layer. In step (S110), the graphene powder having an average diameter of 100 μ m or less is used, and the aqueous binder is polyacrylic acid. The graphene coating layer is formed to a thickness of 15-25 μ m, and improves impregnability for polar electrolyte and uniformly generates lithium ion flux to suppress dendrite generation. USE - Modification of graphene separator used for electrochemical device (all claimed). Uses include but are not limited to mobile phone, camcorder, notebook personal computer, and electric vehicle. ADVANTAGE - The method suppresses dendrite generation by uniformly generating ion flux, and improving impregnability for polar electrolyte. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: the graphene separator, which comprises a separator component arranged to face the lithium anode, and the graphene coating layer formed by mixing graphene powder with aqueous binder; and an electrochemical device, which comprises a separator, a lithium negative electrode arranged above the separator and facing the separator, and an anode arranged below the separator and facing the separator. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of the modification of graphene separator. (Drawing includes non-English language text) S110Mixing process S120Coating process S130Formation of graphene coating layer